When analyzing EEG data, especially event-related potentials (ERPs), a reliable relationship between event markers and actual events is crucial. This article introduces the means to measure timing delays and latencies in your EEG recording setup.
The Photo Sensor measures the screen brightness and, when combined with StimTrak, generates a trigger at the exact stimulus onset. It is a valuable tool to check the performance of a monitor or any experiment control software. This becomes essential if visual stimuli are planned to be presented on a tablet or cell phone display.